CAJ | 학술논문

为有效提高高强钢筋辊式矫直精度，基于楔钳作用机理提出一种多段变形、统一曲率多辊止转筋机构，即两侧上辊分别压下，针对不同直径高强钢筋，形成与之匹配的大变形曲率，并处于楔钳夹持状态，保证后续矫直过程的止转筋。在对高强钢筋应力应变分析的基础上，采用工程弹塑性力学基本理论，推导钢筋弹复扭矩方程，结合止转辊系力学模型，建立止转筋变形协调方程，确立钢筋止转条件；应用ANSYS/LS-DYNA对止转筋机构工作过程进行有限元模拟，并对钢筋转动角度随时间变化规律、接触应力状态进行探究。仿真与试验结果表明，该机构在保证接触强度的条件下，能实现高强钢筋矫直过程，并有效提高矫直精度，可为实际生产提供指导。
위유효제고고강강근곤식교직정도，기우설겸작용궤리제출일충다단변형、통일곡솔다곤지전근궤구，즉량측상곤분별압하，침대불동직경고강강근，형성여지필배적대변형곡솔，병처우설겸협지상태，보증후속교직과정적지전근。재대고강강근응력응변분석적기출상，채용공정탄소성역학기본이론，추도강근탄복뉴구방정，결합지전곤계역학모형，건립지전근변형협조방정，학립강근지전조건；응용ANSYS/LS-DYNA대지전근궤구공작과정진행유한원모의，병대강근전동각도수시간변화규률、접촉응력상태진행탐구。방진여시험결과표명，해궤구재보증접촉강도적조건하，능실현고강강근교직과정，병유효제고교직정도，가위실제생산제공지도。
In order to improve the straightening quality of high strength steel bars , a roller standstill locking mechanism with multi-section deformation and uniform curvature was proposed based on wedge clamp mechanism .On both sides ,two upper roll-ers pressed on the bars respectively ,which formed the matched large deformation curvature according to different diameter high strength steel bars . In the wedge clamp state , the standstill locking of reinforcing steel bars in the subsequent straightening process was guaranteed .Based on the analysis of the stress and strain of the high strength steel bars , the elastic recovery torque equation was deduced in reinforcing steel elastic recovery process using engineering elastic-plastic mechanics . The deformation co-ordinate equation of the reinforcing bars was established combined with standstill locking roller mechanical model ,and the stand-still locking condition of reinforcing bars was established . Based on ANSYS/LS-DYNA , the working process of the standstill locking mechanism was simulated by finite element method . The rotation angle variation charts of bars , the contact stress state as well as its distortion chart were explored . Test results show that the mechanism could realize the standstill locking of high strength steel bars during straightening and effectively improve the straightening precision under the condition of ensuring the sur-face contact strength .The work has laid foundation for high precision straightening ,and the analysis results can provide guidance for the practical production .